-x^2-30x+108=0

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Solution for -x^2-30x+108=0 equation:


Simplifying
-1x2 + -30x + 108 = 0

Reorder the terms:
108 + -30x + -1x2 = 0

Solving
108 + -30x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-108 + 30x + x2 = 0

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + 30x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + 30x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + 30x + x2 = 0 + 108
30x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
30x + x2 = 108

The x term is 30x.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30x + 225 + x2 = 108 + 225

Reorder the terms:
225 + 30x + x2 = 108 + 225

Combine like terms: 108 + 225 = 333
225 + 30x + x2 = 333

Factor a perfect square on the left side:
(x + 15)(x + 15) = 333

Calculate the square root of the right side: 18.248287591

Break this problem into two subproblems by setting 
(x + 15) equal to 18.248287591 and -18.248287591.

Subproblem 1

x + 15 = 18.248287591 Simplifying x + 15 = 18.248287591 Reorder the terms: 15 + x = 18.248287591 Solving 15 + x = 18.248287591 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = 18.248287591 + -15 Combine like terms: 15 + -15 = 0 0 + x = 18.248287591 + -15 x = 18.248287591 + -15 Combine like terms: 18.248287591 + -15 = 3.248287591 x = 3.248287591 Simplifying x = 3.248287591

Subproblem 2

x + 15 = -18.248287591 Simplifying x + 15 = -18.248287591 Reorder the terms: 15 + x = -18.248287591 Solving 15 + x = -18.248287591 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = -18.248287591 + -15 Combine like terms: 15 + -15 = 0 0 + x = -18.248287591 + -15 x = -18.248287591 + -15 Combine like terms: -18.248287591 + -15 = -33.248287591 x = -33.248287591 Simplifying x = -33.248287591

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.248287591, -33.248287591}

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